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<!DOCTYPE doc [
      <!ENTITY nbsp "&#160;">
      <!ENTITY reg "&#174;">
      <!ENTITY uuml "ü">
      <!ENTITY auml "ä">
      <!ENTITY ouml "ö">
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<html>
  <body>
    <p>Testing &nbsp;</p>
    <p>Testing &reg;</p>    
    <p>Testing &uuml;</p>
    <p>Testing &auml;</p>        
    <p>Testing &ouml;</p>
  </body>
</html>  